Two Olympic gold medalists from Russia denied doping Friday, a day after they were named in a newspaper report detailing state-sponsored cheating at the 2014 Sochi Games.
Bobsled champion Alexander Zubkov and cross-country skier Alexander Legkov were among the athletes accused in a New York Times article of doping by the former head of the Russian national drug-testing laboratory.
"What's written now in this article is baseless libel," Zubkov told Russian state TV, adding that he regularly gave doping samples in his career.
"I'm a person who has worked for many years in sport, competed at the Olympics, and I know how much responsibility each athlete bears when they compete at such a high level."
The article also brought a strong response from the Kremlin. Russian President Vladimir Putin's spokesman denounced the allegations as "a turncoat's libel."
Grigory Rodchenkov, the former head of the Russian lab now living in Los Angeles, told the Times that he was given a spreadsheet of doping athletes by the Sports Ministry ahead of the games. It allegedly bore the names of 15 athletes who later won medals, including Zubkov and Legkov.
The spreadsheet was not published and The Associated Press could not verify it.
Rodchenkov said he then switched out tainted urine samples for clean ones at the doping lab used for the games in Sochi, with help from people he believed to be officers of the Russian security services.
Legkov defended his "honest medals" and said Rodchenkov, who resigned as lab director last year following separate allegations that he covered up doping in track and field, was not a credible source.
"I don't understand why a person like this should be believed, trusted or anything else," Legkov said in televised comments.
Zubkov and Legkov are two of Russia's most prominent winter sports athletes.
Zubkov carried the Russian flag at the opening ceremony for the Sochi Olympics and won gold in the two-man and four-man bobsled events at the age of 39, becoming one of the oldest pilots to win an Olympic event.
Legkov won gold in the men's 50-kilometer cross-country mass start on the last day of the games and was given his gold medal at the closing ceremony.
Putin spokesman Dmitry Peskov said the Kremlin rejects the accusations that the Russian government oversaw a state-sponsored doping program and subsequent cover-up.
"It just seems like, you know, some kind of a turncoat's libel," Peskov said, without mentioning Rodchenkov by name. "I wouldn't put trust in such unfounded claims."
The government continues to back Sports Minister Vitaly Mutko, Peskov added.
The World Anti-Doping Agency is set to investigate Rodchenkov's allegations, and Rodchenkov himself has volunteered to identify which samples he tampered with.
The International Olympic Committee on Thursday said that the "allegations are very detailed and very worrying and we ask the World Anti-Doping Agency to investigate immediately."
The IOC said, based on the result of the WADA inquiry, that it "will not hesitate to act with its usual policy of zero tolerance for doping and defending the clean athletes."